From NWN2Wiki
// Returns Item property on hit -> do effect property. You must specify the on
// hit property constant(IP_CONST_ONHIT_*) and the save DC constant(IP_CONST_ONHIT_SAVEDC_*).
// Some of the item properties require a special parameter as well. If the
// property does not require one you may leave out the last one. The list of
// the ones with 3 parameters and what they are are as follows:
// ABILITYDRAIN :nSpecial is the ability it is to drain.
// constant(IP_CONST_ABILITY_*)
// BLINDNESS :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// CONFUSION :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// DAZE :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// DEAFNESS :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// DISEASE :nSpecial is the type of desease that will effect the victim.
// constant(DISEASE_*)
// DOOM :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// FEAR :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// HOLD :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// ITEMPOISON :nSpecial is the type of poison that will effect the victim.
// constant(IP_CONST_POISON_*)
// SILENCE :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// SLAYRACE :nSpecial is the race that will be slain.
// constant(IP_CONST_RACIALTYPE_*)
// SLAYALIGNMENTGROUP:nSpecial is the alignment group that will be slain(ie. chaotic).
// constant(IP_CONST_ALIGNMENTGROUP_*)
// SLAYALIGNMENT :nSpecial is the specific alignment that will be slain.
// constant(IP_CONST_ALIGNMENT_*)
// SLEEP :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// SLOW :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
// STUN :nSpecial is the duration/percentage of effecting victim.
// constant(IP_CONST_ONHIT_DURATION_*)
itemproperty ItemPropertyOnHitProps(int nProperty, int nSaveDC, int nSpecial=0);
